Extensible, reversible, and self-sharpening dipper tooth



July 3111, 11923. 1,463.725

J. F. PRYOR EXTENSIBLE, REVERSIBLE, AND SELF SHARPENING DIPPER TOOTH Filed April 3, 1922 gmuewto'c Patented July 31, 1923.

UNITED STATES PATENT OFFICE.

EXTENSIBLE, REVERSIBLE, AND SELF-SHARPENING DIPPEB TOOTH.

Application filed April 3, 1922. Serial No. 549,088.

To all whom't may concern:

Be it known that l, J osnru F. Peron, a citizen of the United States, residing at Houghton, in the county of Houghton and State of Michigan, have invented certain new and useful Improvements in Extensible, Reversible, and Self-Sharpening Dipper Teeth; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved dipper tooth for use in connection with excavating machines and dredging machines and one object of the invention is to provide a dipper tooth which may be firmly held in engagement with the forward edge portion of the dipper bucket, and may be provided with a cutter which is removably held in place so that it may be removed and a new one put in place when necessary and which may be longitudinally adjusted so that as it becomes worn oil it may be reversed and projected forwardly and secured in the adjusted position.

Another object of the invention is to so construct this dipper tooth that the projector bar may be adj ustably connected with one of the rearwardly extending arms of the dipper tooth and have its forward end interlock with the rear end of the cutter thus permitting the cutter to be moved longitudinally with the projector bar and securely held against longitudinal movement when bolts are passed through openings in the arm of the tooth and through selected openings formed in the projector bar.

Another object of the invention is to so construct this dipper tooth that the projector bar may be braced against transverse movement and thus any tendency to break the bar or cutter at the joint prevented.

Another object of the invention is to so construct this dipper tooth that the bolts for the projector bar may be released and the projector bar moved longitudinally to adjust the position of the cutter without it being necessary to remove the tooth itself from the dipper bucket. 7

Another object of the invention is to so construct the body portion of the dipper tooth that the portion which extends forwardly beyond the forward edge of the dipper bucket will be tapered and thus be provided with convex surfaces which will further so constructed that the bolts for re leasably holding the projector bar in an adusted positlon may be passed through the front of the dipper bucket and assist in holding the dipper tooth in place.

This invention is illustrated in the accompanying drawings, wherein;

Flgure 1 is a view showing the dipper tooth in side elevation.

Figure 2 is a top plan view of the dipper tooth.

Figure 3 is a longitudinal sectional view taken along the line 3-3 of Fig. 1.

Figure 4 is a longitudinal sectional view taken along the line 4-4 of Fig. 2.

Figure 5 is a transverse sectional view taken along the line 5-5 of Fig. 1.

This improved dipper tooth has its forward portion 1 tapering forwardly as shown and is provided with upper and lower arms 3 and 4. which extend rearwardly from the tapered forward portion in spaced relation one above the other so that the tooth may be put in place with the top or lip of the dipper bucket extending between the arms and the lower arm engaging the front face of the bucket. The side portions 5 of the upper arm terminate in alinement with the rear end of the lower arm and these side portions and the upper portions of the side faces of the forward portion of the tooth taper upwardly as shown in Figs. 2 and 5 so that when the tooth is in place, these upwardly converging faces of the tooth and upper arm will provide convex faces to prevent boulders and large rock from becoming wedged between the teeth of the bucket. Alined openings 6 and 7 are formed in the upper and lower arms to receive fastener bolts, the

The cutter 8 extends through a passage 9 -formed in the forward end portion of this dipper tooth and extends between the arms and against the underface of the upper arm. Abutment blocks 10 are carried by the side lull portions of the upper arm and extend downwardly upon opposite sides of the 1nner end portion of the cutter 8 so that this cutter 8 will be braced against transverse movement and so that when the forward end portion of the projector bar 11 is positioned between these abutment blocks, the forward end portion of the projector bar will be braced against transverse movement. From an inspection of Fig. 3, it will be seen that the forward end portion of this projector bar is of the same thickness as the cutter and that this thickened forward end portion of the projector bar is cut out to provide a socket 12 to receive the correspondingly shaped head 13 formed at the inner end of the cutter. It should be noted of the arms 5 through which tooth is mounted upon the bucket or they that the projectonbar and cutter will therefore be connected by a joint resembling a dove-tailed joint and that therefore when the projector bar is moved longitudinally the cutter will be moved with it and will be prevented from having longitudinal movement when the projector bar is secured in a set position. When however the securing bolts 14 are removed, the projector bar and cutter may be moved forwardly until the forward end of the projector bar extends beyond the forward end of the tooth. The cutter can then be removed from the bar and a new one put in place. In order to permit the cutter to be projected forwardly as the cutter is worn off, the projector bar has been provided with a plurality of openings 15 which are spaced apart longitudinally of the projector bar and so placed that a selected set of these openings 15 may be brought into registry with the openings the securing bolts 14 pass.

When this dipper tooth is in use, it will be put in place with the lip or top of the bucket projecting between the upper and lower arms of the tooth. The projector bar and cutter may be put in place before the can be put in place afterwards. After the tooth has been put in the proper position, the fastener bolt will be passed through the openings 6 and 7 and the tooth will be securely held in place. As previously explained, these teeth are forwardly and upwardly and therefore convex surfaces will be provided which will tend to move rocks rearwardly and prevent them from becoming wedged between the teeth when the excavator or dredge is in use. When the securing bolts 14 are put in place, the projector bar will be secured against longitudinal movement and the cutter will extend beyond the forward end of the tooth a desired amount. When the tooth has become worn to such an extent that it does not project forwardly beyond the tooth the desired amount, the bolts 14 will be removed and the projector bar moved forwardly, and cutter reversed at the socket joint, and dropped back in position. This will cause the cutter to be moved forwardly and when again in the proper position, the bolts 14 will be replaced. If it is desired to remove the cutter so that it can be resharpened or a new one put in place, it is simply necessary to move the projector forwardly until its forward end extends beyond the forward end of the dipper tooth. The cutter can then be moved by releasing the bolts 14 from the forward end of the projector bar and a new one put in place, if worn too short; or the old one simply reversed and the projector bar and cutter thrust inwardly until the cutter is in the proper position.

A dipper tooth has thus been provided which can be readily put in place or removed and which is further so constructed that rocks will not tend to wedge between the teeth. There has further been provided a dipper tooth having an improved type of cutter releasably connected with a projector bar which is movable longitudinally to hold the cutter in the proper position and which may b securely held in an adjusted position by bolts carried by the upper arms of the dipper tooth. This tooth is bolted in the usual manner.

I claim:

1. A dipper tooth having a longitudinally extending passage, a cutter extending through the passage and projectable beyond the forward end of said tooth, means connected with the cutter for projecting the cutter forwardly, and releasable means for securing said means in adjusted positions with a predetermined portion of the cutter extending beyond the forward end of the tooth.

2. The structure of claim 1 having the means for projecting the cutter forwardly consisting of a projector having its forward end releasably connected with the inner end of the cutter by an interlocking joint.

3. The structure of claim 1 having the means for projecting the cutter forwardly consistlng of a pro ector adjustably connected with the dipper tooth and having its forward end engaging the rear end of the cutter and connected therewith by means of a dove-tail joint.

4. The structure of claim 1 having the dipper tooth provided with rearwardly extending arms and the means for projecting the cutter forwardly consisting of a bar extending along one of the arms and having its forward end releasably connected with the cutter, and means for releasably securing the bar against longitudinal movement.

5. The structure of claim 1 having the dipper tooth provided with rearwardly extending arms and the means for projecting the cutter forwardly consisting of a bar extending along one of the arms and having its forward end releasably connected with the cutter, the saidarm of the dipper tooth being provided with bolt receiving openings and the projector bar having openings for registering with the openings of the said arm when the bar and cutter are moved longitudinally, and bolts passing through the openings of the bar to releasably hold the bar in place with the cutter projecting beyond the forward end of the tooth a predetermined extent.

'6. The structure of claim 1 having the dipper tooth provided with rearwardly extending arms and the means for projecting the cutter forwardly consisting of a bar extending along one of the arms and having its forward end releasably connected with the cutter, the said arm of the dipper tooth being provided with bolt receiving openings and the projector bar having openings for registering with the openings of the said arm when the bar and cutter are moved longitudinally, and bolts passing throu h the openings ofthe said arm and through selected openings of the bar to releasably hold the bar in place with the cutter projecting beyond the forward end of the tooth a redetermined extent, the said arm of the ipper tooth being provided with abutment lugs extending upon opposite sides of the bar and holding the bar against transverse movement.

7. The structure of claim 1 having the dipper tooth provided with rearwardly extending arms and the means for projecting the cutter forwardly consisting of a bar extending along one of t e arms and bar its forward end releasablv connected with the cutter, the said arm of the dipper tooth being providedrwi'th bolt receiveing openings and the projector bar having openings for registering with the openings of the said arm when the bar and cutter are moved longitudinally, and bolts passing through the openings of the" said arm and through selected openings of the bar to releasably whereby bolts may be passed through the side portions of the arms and through the forward edge portion of the top of a dipper bucket.

8. The structure of claim 1 having the tooth provided with upper and lower rearwardl extending arms, the projector being a justably connected with one of said arms and the tooth being tapered forward ly from the arms.

9. The structure of claim 1 having the tooth provided with upper and lower rearwardly extending arms, the projector being adjustably connected with one of said arms and the tooth being tapered forwardly from the arms, and having its side faces converging upwardly.

In testimony whereof l have hereunto set In hand.

y JOSEPH F. PRYOR. 

